Aug. 29 (Bloomberg) – Iceland is monitoring a fissure eruption north of the Bardarbunga volcano as authorities downgraded the threat of a full-blown ash cloud.

The Icelandic Met Office lowered their aviation warning level to "orange," after earlier raising it to the highest level following the eruption, according to an e-mailed statement. "A significant emission of ash into the atmosphere is not likely," the agency said.

Airlines are on alert for a potential repeat of a disruption in 2010, when a volcano under the Eyjafjallajokull ice cap spewed a column of ash 9 kilometers (5.6 miles) into the air. The eruption shut airspace across Europe for six days, forcing carriers to cancel more than 100,000 flights. Ash is a danger because the glass-like particles can damage jet engines.

"Currently we're just monitoring the eruption, which is very weak," Rikke Pedersen, a geophysicist at the Nordic Volcanological Center, said by telephone. "The fissure could probably extend southwards or northwards and open up beneath the ice. But we'll have to see — only time will tell."

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